Sure thing! We've got 543 and we're gonna multiply it by 149. That's the same as adding 543 to itself 149 times.
Step 1: 0 + 543 = 543
Step 2: 543 + 543 = 1086
Step 3: 1086 + 543 = 1629
Step 4: 1629 + 543 = 2172
Step 5: 2172 + 543 = 2715
Step 6: 2715 + 543 = 3258
Step 7: 3258 + 543 = 3801
Step 8: 3801 + 543 = 4344
Step 9: 4344 + 543 = 4887
Step 10: 4887 + 543 = 5430
Step 11: 5430 + 543 = 5973
Step 12: 5973 + 543 = 6516
Step 13: 6516 + 543 = 7059
Step 14: 7059 + 543 = 7602
Step 15: 7602 + 543 = 8145
Step 16: 8145 + 543 = 8688
Step 17: 8688 + 543 = 9231
Step 18: 9231 + 543 = 9774
Step 19: 9774 + 543 = 10317
Step 20: 10317 + 543 = 10860
Step 21: 10860 + 543 = 11403
Step 22: 11403 + 543 = 11946
Step 23: 11946 + 543 = 12489
Step 24: 12489 + 543 = 13032
Step 25: 13032 + 543 = 13575
Step 26: 13575 + 543 = 14118
Step 27: 14118 + 543 = 14661
Step 28: 14661 + 543 = 15204
Step 29: 15204 + 543 = 15747
Step 30: 15747 + 543 = 16290
Step 31: 16290 + 543 = 16833
Step 32: 16833 + 543 = 17376
Step 33: 17376 + 543 = 17919
Step 34: 17919 + 543 = 18462
Step 35: 18462 + 543 = 19005
Step 36: 19005 + 543 = 19548
Step 37: 19548 + 543 = 20091
Step 38: 20091 + 543 = 20634
Step 39: 20634 + 543 = 21177
Step 40: 21177 + 543 = 21720
Step 41: 21720 + 543 = 22263
Step 42: 22263 + 543 = 22806
Step 43: 22806 + 543 = 23349
Step 44: 23349 + 543 = 23892
Step 45: 23892 + 543 = 24435
Step 46: 24435 + 543 = 24978
Step 47: 24978 + 543 = 25521
Step 48: 25521 + 543 = 26064
Step 49: 26064 + 543 = 26607
Step 50: 26607 + 543 = 27150
Step 51: 27150 + 543 = 27693
Step 52: 27693 + 543 = 28236
Step 53: 28236 + 543 = 28779
Step 54: 28779 + 543 = 29322
Step 55: 29322 + 543 = 29865
Step 56: 29865 + 543 = 30408
Step 57: 30408 + 543 = 30951
Step 58: 30951 + 543 = 31494
Step 59: 31494 + 543 = 32037
Step 60: 32037 + 543 = 32580
Step 61: 32580 + 543 = 33123
Step 62: 33123 + 543 = 33666
Step 63: 33666 + 543 = 34209
Step 64: 34209 + 543 = 34752
Step 65: 34752 + 543 = 35295
Step 66: 35295 + 543 = 35838
Step 67: 35838 + 543 = 36381
Step 68: 36381 + 543 = 36924
Step 69: 36924 + 543 = 37467
Step 70: 37467 + 543 = 38010
Step 71: 38010 + 543 = 38553
Step 72: 38553 + 543 = 39096
Step 73: 39096 + 543 = 39639
Step 74: 39639 + 543 = 40182
Step 75: 40182 + 543 = 40725
Step 76: 40725 + 543 = 41268
Step 77: 41268 + 543 = 41811
Step 78: 41811 + 543 = 42354
Step 79: 42354 + 543 = 42897
Step 80: 42897 + 543 = 43440
Step 81: 43440 + 543 = 43983
Step 82: 43983 + 543 = 44526
Step 83: 44526 + 543 = 45069
Step 84: 45069 + 543 = 45612
Step 85: 45612 + 543 = 46155
Step 86: 46155 + 543 = 46698
Step 87: 46698 + 543 = 47241
Step 88: 47241 + 543 = 47784
Step 89: 47784 + 543 = 48327
Step 90: 48327 + 543 = 48870
Step 91: 48870 + 543 = 49413
Step 92: 49413 + 543 = 49956
Step 93: 49956 + 543 = 50499
Step 94: 50499 + 543 = 51042
Step 95: 51042 + 543 = 51585
Step 96: 51585 + 543 = 52128
Step 97: 52128 + 543 = 52671
Step 98: 52671 + 543 = 53214
Step 99: 53214 + 543 = 53757
Step 100: 53757 + 543 = 54300
Step 101: 54300 + 543 = 54843
Step 102: 54843 + 543 = 55386
Step 103: 55386 + 543 = 55929
Step 104: 55929 + 543 = 56472
Step 105: 56472 + 543 = 57015
Step 106: 57015 + 543 = 57558
Step 107: 57558 + 543 = 58101
Step 108: 58101 + 543 = 58644
Step 109: 58644 + 543 = 59187
Step 110: 59187 + 543 = 59730
Step 111: 59730 + 543 = 60273
Step 112: 60273 + 543 = 60816
Step 113: 60816 + 543 = 61359
Step 114: 61359 + 543 = 61902
Step 115: 61902 + 543 = 62445
Step 116: 62445 + 543 = 62988
Step 117: 62988 + 543 = 63531
Step 118: 63531 + 543 = 64074
Step 119: 64074 + 543 = 64617
Step 120: 64617 + 543 = 65160
Step 121: 65160 + 543 = 65703
Step 122: 65703 + 543 = 66246
Step 123: 66246 + 543 = 66789
Step 124: 66789 + 543 = 67332
Step 125: 67332 + 543 = 67875
Step 126: 67875 + 543 = 68418
Step 127: 68418 + 543 = 68961
Step 128: 68961 + 543 = 69504
Step 129: 69504 + 543 = 70047
Step 130: 70047 + 543 = 70590
Step 131: 70590 + 543 = 71133
Step 132: 71133 + 543 = 71676
Step 133: 71676 + 543 = 72219
Step 134: 72219 + 543 = 72762
Step 135: 72762 + 543 = 73305
Step 136: 73305 + 543 = 73848
Step 137: 73848 + 543 = 74391
Step 138: 74391 + 543 = 74934
Step 139: 74934 + 543 = 75477
Step 140: 75477 + 543 = 76020
Step 141: 76020 + 543 = 76563
Step 142: 76563 + 543 = 77106
Step 143: 77106 + 543 = 77649
Step 144: 77649 + 543 = 78192
Step 145: 78192 + 543 = 78735
Step 146: 78735 + 543 = 79278
Step 147: 79278 + 543 = 79821
Step 148: 79821 + 543 = 80364
Step 149: 80364 + 543 = 80907

So, 543*149 = 80907